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An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 21.0 days on average to complete one nearly circular revolution around the unnamed planet. If the distance from the center of the moon to the surface of the planet is 2.030 × 10^5 km and the planet has a radius of 3.700 × 10^3 km, calculate the moon's radial acceleration.

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